Mario Williams will be heading out of Buffalo after four seasons, according to an ESPN report Tuesday. Click through the gallery to revisit Williams' career through the years.

Mario Williams will be heading out of Buffalo after four seasons, according to an ESPN report Tuesday. Click through the gallery to revisit Williams' career through the years.

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According to a new report, Mario Williams' days with the Bills may be numbered. He signed with them before the 2012 season.

According to a new report, Mario Williams' days with the Bills may be numbered. He signed with them before the 2012 season.

Photo: Don Juan Moore, Getty Images

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Buffalo Bills defensive end Mario Williams (94) stands on the sidelines at the end of his team's 50-17 loss to the Seattle Seahawks in an NFL football game on Sunday, Dec. 16, 2012, in Toronto. (AP Photo/Mike Groll) less

Buffalo Bills defensive end Mario Williams (94) stands on the sidelines at the end of his team's 50-17 loss to the Seattle Seahawks in an NFL football game on Sunday, Dec. 16, 2012, in Toronto. (AP Photo/Mike ... more

Photo: Mike Groll, AP

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Mario Williams played his last game as a Texan in 2011.

Mario Williams played his last game as a Texan in 2011.

Photo: Karen Warren, Houston Chronicle

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Reliant rocked when Mario Williams was at his best.

Reliant rocked when Mario Williams was at his best.

Photo: Brett Coomer, Houston Chronicle

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Mario Williams suffered a torn pectoral muscle that ended his season in 2011.

Mario Williams suffered a torn pectoral muscle that ended his season in 2011.

Photo: Brett Coomer, Houston Chronicle

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Wade Phillips and Mario Williams was a combination the Texans were excited about.

Wade Phillips and Mario Williams was a combination the Texans were excited about.

Photo: Nick De La Torre, Houston Chronicle

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Mario Williams was always generous to the fans.

Mario Williams was always generous to the fans.

Photo: Steve Campbell, Houston Chronicle

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Fans came up with a nickname for an appropriate Mario Williams.

Fans came up with a nickname for an appropriate Mario Williams.

Photo: James Nielsen, Houston Chronicle

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Mario Williams met the troops during a stint with the USO.

Mario Williams met the troops during a stint with the USO.

Photo: Dave Gatley, USO

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Mario Williams was selected to the Pro Bowl in 2008 and 2009. He started the 2008 game.

Mario Williams was selected to the Pro Bowl in 2008 and 2009. He started the 2008 game.

Photo: Nick De La Torre, Houston Chronicle

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Injuries plagued Mario Williams in 2010 and 2011.

Injuries plagued Mario Williams in 2010 and 2011.

Photo: James Nielsen, Houston Chronicle

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Mario Williams took part in many charitable efforts.

Mario Williams took part in many charitable efforts.

Photo: Mayra Beltran, Houston Chronicle

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Mario Williams was known for his clutch sacks.

Mario Williams was known for his clutch sacks.

Photo: Brett Coomer, Houston Chronicle

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Mario Williams scored the cover of ESPN The Magazine.

Mario Williams scored the cover of ESPN The Magazine.

Photo: ESPN PR

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Mario Williams is a two-time ESPN The Magazine cover star.

Mario Williams is a two-time ESPN The Magazine cover star.

Photo: ESPN PR

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Fans wanted the Texans to draft Vince Young in 2006 over Mario Williams.

Fans wanted the Texans to draft Vince Young in 2006 over Mario Williams.

Photo: David Phillip, AP

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Mario Williams had a solid rookie season with 47 total tackles, 4.5 sacks, and a forced fumble.

Mario Williams had a solid rookie season with 47 total tackles, 4.5 sacks, and a forced fumble.

Photo: Brett Coomer, Houston Chronicle

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Mario Williams is greeted in town.

Mario Williams is greeted in town.

Photo: Jessica Kourkounis, For The Chronicle

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Mario Williams was the Texans first pick in 2006.

Mario Williams was the Texans first pick in 2006.

Photo: Nick De La Torre, Houston Chronicle

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The pick of Mario Williams by the Texans was not a popular one since fans wanted local star Vince Young instead.

The pick of Mario Williams by the Texans was not a popular one since fans wanted local star Vince Young instead.

Photo: Bill Baptist, Getty

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Bob McNair welcomes his No. 1 draft pick.

Bob McNair welcomes his No. 1 draft pick.

Photo: Brett Coomer, Houston Chronicle

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Mario Williams was considered an elite prospect going into the 2006 NFL Draft.

Mario Williams was considered an elite prospect going into the 2006 NFL Draft.

Photo: Dave Einsel, AP

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At the NFL combine before the draft, Mario Williams ran a 4.66 and a 4.73 forty-yard dash. He also bench-pressed 225 pounds 35 times and had a 40½ vertical leap.

At the NFL combine before the draft, Mario Williams ran a 4.66 and a 4.73 forty-yard dash. He also bench-pressed 225 pounds 35 times and had a 40½ vertical leap.

Photo: Jeff Zelevansky, AP

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Mario Williams played college football at North Carolina State University.

Mario Williams played college football at North Carolina State University.

Photo: Bob Leverson, Tsn

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Report: Ex-Texans star Mario Williams out in Buffalo

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Back to Gallery

Former Texans defensive end Mario Williams apparently will be looking for a new team this offseason.

In March 2012, Williams signed a six-year contract with the Bills worth reportedly up to $100 million ($49.5 million guaranteed), but will depart Western New York two seasons shy of fulfilling that pact.

In four seasons with the Bills, Williams had 43 sacks, but only five in 2015, as his skill set apparently didn't mesh with new coach Rex Ryan's scheme. In his first three Buffalo campaigns, Williams had seasons with 10.5, 13 and 14.5 sacks.

Williams, who turned 31 on Jan. 31, had 53 sacks in 82 games with the Texans from 2006-11, but missed 11 games in his final season in Houston.